Unironically bad. We need a lone-wolf to successfully execute an attack now while it's still relatively benign so we can scare the hell out of the world while it's still a mid-tier virus. No way is someone going to make a humanity killing virus with GPT 5.5, but it might be possible with GPT 20 circa 2040.

Similar argument for why we HAD to use nukes at the end of WW2. If we hadn't, the nuclear taboo likely wouldn't have existed and we'd likely have had a worse nuclear war in our more recent history.